The AppData folder in Windows Vista is equal to the Documents and Settings folder in Windows XP. The AppData folder is also hidden in Vista.
To unhide this folder (and others), open the Folder Options in the Vista Control Panel, and on the “View” tab, change the option to “show hidden files and folders”, and click ok.
According to ComputerPerformance.co.uk…
“The key phrase is, change in location. Vista has a new Users Folder which replaces XP’s Documents and Settings. Within the new folder structure, Vista has a folder called plain ‘Documents’, which replaces XP’s ‘My Documents’ folder. The most important new subfolder is AppData. Also to maintain backward compatibility, Vista has shortcut links to the old XP folders such as Local Settings and Application Data.”